Hardware description, 1 communication sequence, 2 hardware composition – Toshiba TEC MA-1900 User Manual

Page 6: 3 hardware differences from stand-alone ecr, Communication sequence

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3. HARDWARE DESCRIPTION

3-1 COMMUNICATION SEQUENCE

TDLC (TEC Data Link Control) / 31.25KBPS

3-2 HARDWARE COMPOSITION

A Master-Satellite System is realized by adding the following in-line units to each stand
alone ECR:

Master (or Backup Master) ECR

Stand-alone Spec. + Master In-line Unit

• Interface Board
• In-line Cable
• RTR position (on GT Lock) and RTR Key

Satellite ECR

Stand-alone Spec. + Satellite In-line Unit

• Interface Board
• In-line Cable

NOTE: The components for the Backup Master ECR is exactly the same as those for the

Master ECR. The distinction in an actual system loop will be made by the “RTR**

position of the GT Lock for the Master use and the Neutral Position for Backup

Master use. (A key operation to declare the change from Master to Backup Master,
or vice versa, is further necessary.)

3-3 HARDWARE DIFFERENCES FROM STAND-ALONE ECR

1) GT LOCK (for Master ECR or Backup Master ECR)

The “RTR” position is newly provided.

* / QJ

(For a Satellite ECR, the lock remains the same as a
stand-alone ECR.)

Must be turned to this position when the ECR is

installed as the Master ECR and any in-line mode
operations are required.

A Backup Master ECR must keep this potion while it is

used as a Satellite ECR. When the original Master

ECR becomes down, the Lock can be turned to the

“RTR” position to enable this ECR to be used as a

new Master ECR of the system. (Refer to the NOTE in
3.2 above.)

“RTR” position

(Neutral Position) . .

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